package com.lu.exception;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Component
public class ExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest,
                                         HttpServletResponse httpServletResponse,
                                         Object o,
                                         Exception e) {
        ModelAndView modelAndView = new ModelAndView();
        if (e instanceof NullPointerException){
            modelAndView.addObject("msg","空指针");
        }else if (e instanceof ArithmeticException){
            modelAndView.addObject("msg","算数运算异常");
        }else {
            modelAndView.addObject("msg","俺也不知道啥问题");
        }
        modelAndView.setViewName("error.jsp");
        return modelAndView;
    }
}
